Giant whirlpool drops ocean level in Australia

The mysterious whirlpool is 200 kilometres across and 1000 metres deep, reaching the ocean floor, CSIRO oceanographers say. The centre is 100 kilometres from the coast and could stay there for several months.

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Cold-water Eddy 'Monsters' Mighty Current Off Sydney
Live Science

Dr Griffin, from the Wealth from Oceans Flagship Research program, said cold-water eddies regularly appear off Sydney.

“Until 20 years ago we would not have known they even existed without accidentally steaming through them on a research vessel,” he said.

Ocean eddies can have a life of 2-3 weeks although similar eddies identified off South Australia and Western Australia are known to have survived several months.



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A La Niña in 2007?
The chance of a La Niña developing in 2007 is thought to be higher than the long-term average (which is about one in five or 20%) because (a) they have a tendency to follow an El Niño; (b) the El Niño has decayed somewhat earlier than normal thereby giving time for a La Niña to begin developing during the critical March to June period; and (c) a large pool of cold sub-surface water remains in the central to eastern tropical Pacific Ocean and is starting to affect surface temperatures in the region. La Niña events are generally associated with wetter than normal conditions across much of the eastern half of the country from about autumn. Computer models generally indicate further cooling in the Pacific Ocean.

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